From the look of the pdf, looks like it's a simple ground (connects to ones already there) and one wire you need to feed through the firewall and add into the junction box as shown. I'd look at it from there. If you can get an actual wiring diagram for it from a dealership even better!
Only now due to doing some reading. I have from factory things like autodim rearview mirror, heated side mirrors, power seats both driver and passenger, infinity sound system (deck has cassette/cd/eq) fog lights, home link, etc.
The beatings will continue until attitudes improve!
HID Quad bi-xenon + foglight retrofit